Surface-modified cathode materials based on an LiCoO2-LiMn2O4 composite

Surface-modified cathode materials based on an LiCoO2-LiMn2O4 composite

A process has been developed for surface modification of an equimolar LiCoO 2 -LiMn 2 O 4 composite with a mixture of alumina (Al 2 O 3 ) and boehmite (AlO(OH)). The alumina: boehmite ratio and pH value have been optimized in order to achieve adequate surface adhesion between the coating and powder...

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Veröffentlicht in:Inorganic materials 2009-08, Vol.45 (8), p.935-941
Hauptverfasser: Makhonina, E. V., Shatilo, Ya. V., Dubasova, V. S., Nikolenko, A. F., Ponomareva, T. A., Kisterev, E. V., Pervov, V. S.
Format: Artikel
Sprache:eng
Schlagworte:
Aluminum oxide
Boehmite
Chemistry
Chemistry and Materials Science
Coating
Electric potential
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Nanocomposites
Nanomaterials
Nanostructure
Voltage
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Zusammenfassung:A process has been developed for surface modification of an equimolar LiCoO 2 -LiMn 2 O 4 composite with a mixture of alumina (Al 2 O 3 ) and boehmite (AlO(OH)). The alumina: boehmite ratio and pH value have been optimized in order to achieve adequate surface adhesion between the coating and powder and good homogeneity of the nanocoatings. The effects of ultrasonic processing, coating conditions, and thermal annealing have been examined. The results demonstrate that the nanocoatings considerably improve the cyclability of the composite in an extended voltage range (up to 4.5 V) in comparison with the unmodified material and slightly increase its average discharge voltage.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168509080214